I brought ca anti-virus plus

Question

I brought ca anti-virus plus anti-spyware 2008 and the product don't work it won't allow me to register my software thet keep asking me for a licenes key which i don't have it's also asking me to buy another one off the web.now brought this product from you and use and your sell'sman let me know that i couldn't bring it back no refund & no if u don't like it there is no take it back and get u'r money back. so please help me clean my pc.